Process of making phonograph-cylinders.



PATENTED DEC. 13, 3.904.

A. HAUG.

PROCESS 0F MAKING PHONOGRAPH CYLINDERS.

APPLUATIUN FILED 0011.6. 1902.

NO MODI-IL.

` @udma @y Y 544110441701 @3% @Hamm/zu v n Patented December 13, 1904 rauen.

ANDREW HAUG, '0F WEST ORANGE, NEV JERSEY.

PROCESS F MAKING FHONOGFIAFlrl-CYLIINIDEHS.

SPECIFICATION forming part of Letters Patent N o. 777,629, dated December 13, 1904:.

Application filed October 6, 1902. Serial No. 126,080. (No model.)

To all whom, it 7am/y concern:

Beit known that l ANDREW HAUG, a citizen of the United States, residing at Vest Orange, in the county of Essex and State of New Jersey, have invented new and useful Improvements in the Manufacture of Phonograms and in Phonograms, of which the following is a specification.

lhis invention relates to the process of manufacturing phonograms by molding and to phonograms thus manufactured, and has for its object to render the process more eX- peditious and cheaper and the phonogram thus manufactured better.

Heretofore in the manufacture of phonograms by molding heat and cold have not been applied by immersion of the mold at the inner surface of the phonogram, and when the phonogram, which is cylindrical in shape and hollow, has been taken from the mold it has heretofore been necessary to place it upon a reamer in order to shape, to finish or dress, and to give the proper size to the bore of the phonogram-eylinder, especially for the purpose of causing it to iit upon the mandrel of the phonograph.

I have discovered that in the manufacture of phonograms, by the application of heat and cold by immersion of the mold at the inner surface of the phonogram-cylinder during the process of manufacture by molding, a hollow cylindrical phonogram can be more quickly and more economically produced having' a bore of proper shape and of proper size and of finished surface which will lit upon the mandrel of the phonograph and that heat and cold can be applied at the inner surface of the phonogram-cylinder during the process of manufacture by molding by the following method, illustrated in the drawings, which gives very satisfactory results.

Figure l represents a vertical section of a mold for casting phonogram-cylinders according to my invention. Fig. 2 shows the inner surface of a phonogram molded according to my process. Fig. 3 is a top view of the mold shown in Fig. l.

The bottom piece A is the base of the mold.

Bis a hollow cylinder which is screwed into the base A.

C is a' rim which sets en the tube or cylinder B.

D is the core of the mold and is hollow. The core D preferably recessed at the bot tom, as at (l, in order to make the parts at that point lit tightly and prevent the heated liquid wax from entering between the core l) and the inner tube E, which projects into the recess at Ur. Into the ring of the base A of the mold the hollow cylindrical inner tube l0 [its and serves to guide the core fl.) when it is inserted into or withdrawn .from the other parts of the mold and to `keep the core l) when inserted and in place concentric with the outer cylinder B. On the outer surface of the core l) there is preferably a spiral groove H or other hollow for the formation of ribs or projections upon the inner surface of the molded phonogram.

F is the matrix or cavity of the mold into which the molten material from which the phonogram is to be molded enters. The outer surface of the matrix F is cylindrical; but the inner surface of the matrix F is preferably tapering like the surface of a cone.

An important feature of the mold shown in Fig. l and of my invention is that the core l) and the cylinder E are hollow, thereby permitting the entrance by immersion of the mold of a medium for the aplvilieation of heat or cold at the inner surface of the phonogramcylinder during the process of manufacture by molding. The corel) is, preferably higher than the cylinder B. The lower end K of the matrix F may be so shaped that the phonogram when molded will have, at that end the shape desired. Upon the inner surface L of the cylinder B a metallic negative of a phonograpl1-record to be reproduced upon the phonogram to be molded may be placed.

The parts of the mold are made of brass or other suitable material.

In the manufacture of pllonograms according to the process of my invention the mold above described and shown in Fig. l may be lowered into the molten wax or other material from which the phonogram is to be molded until the molten material pours over the rim C into the matrix F and lills the cavity to the desired height. A surplus of molten material is preferably permitted to enter the rim C in order that it may make up for shrinkage of the molten material in the matrix F upon cooling. above described, into the molten material to permit the molten material to pour into the matrix F the molten material rises in the hollow cylinder E within the core D and communicatesits heat through the cylinder E and the core D to the inner surface of the molten material filling the matrix F just as the molten material through the cylinder B communicates its heat to the outer surface of the molten material filling the matrix F. The result of heating the inner surface of the molten material filling the matrix F is to make and keep the molten material thoroughly liquid and enable it to penetrate and ll completely the space of the matrix. By the method described the heating' is quickly accomplished.

In order to cool ofil the mold and the molten material in the matrix F, the mold is now lowered into cold water or other suitable cooling material. Since the water risesin the hollow cylinder E as the mold is lowered into the water, cold is quickly communicated to the inner surface of the molten material iilling the matrix F just as it is communicated to the outer surface. The result is that the molten material filling the matrix F cools quickly and the core D can be extracted from the bore of the molded phonogram, leaving' a As the mold is lowered, as

bore of proper shape and of proper size and of finished surface which will fit upon the mandrel of the phonograph.

VvY hat I claim is- 1. The process of making phonograph-cylinders that consists of introducing molten material into a mold having a hollow core, and applying heat to the inner surface of said core, substantially as described.

2. The process of making phonograph-cylinders that consists of introducing molten material into a mold having a hollow core, and applying heat to the inner surface of said core by immersion of the mold, substantially as described.

3. The process of making phonograph-cylinders that consists of introducing molten material into a mold having a hollow core, and applying heat and cold successively to the inner surface of said core, substantially as described. v

4. rlhe process of making phonograph-cylinders that consists of introducing molten material into a mold having a hollow core, and applying heat and cold successively to the inner surface of said core by immersion of the mold, substantially as described.

In testimony whereof I have signed my name to this specification, this 30th day of September, 1902, in the presence of two subscribing witnesses.

ANDREW HAUG.

iritnesses:

DANIEL A. DUGAN, EDWIN FoRREs'r. 

